public final String coreLookupPrefix()

in mixins/core-mixins/src/main/java/org/apache/axiom/core/impl/mixin/CoreElementMixin.java [191:235]
43 lines of code
13 McCabe index (conditional complexity)

    public final String coreLookupPrefix(String namespaceURI, Semantics semantics)
            throws CoreModelException {
        if (namespaceURI == null) {
            throw new IllegalArgumentException("namespaceURI must not be null");
        }
        if (!semantics.isUseStrictNamespaceLookup()) {
            String prefix = getImplicitPrefix(namespaceURI);
            if (prefix != null) {
                return prefix;
            }
        }
        for (CoreAttribute attr = coreGetFirstAttribute();
                attr != null;
                attr = attr.coreGetNextAttribute()) {
            if (attr instanceof CoreNamespaceDeclaration) {
                CoreNamespaceDeclaration decl = (CoreNamespaceDeclaration) attr;
                if (decl.coreGetCharacterData().toString().equals(namespaceURI)) {
                    return decl.coreGetDeclaredPrefix();
                }
            }
        }
        CoreElement parentElement = coreGetParentElement();
        if (parentElement != null) {
            String prefix = parentElement.coreLookupPrefix(namespaceURI, semantics);
            // The prefix declared on one of the ancestors may be masked by another
            // namespace declaration on this element (or one of its descendants).
            if (!semantics.isUseStrictNamespaceLookup()
                    && getImplicitNamespaceURI(prefix) != null) {
                return null;
            }
            for (CoreAttribute attr = coreGetFirstAttribute();
                    attr != null;
                    attr = attr.coreGetNextAttribute()) {
                if (attr instanceof CoreNamespaceDeclaration) {
                    CoreNamespaceDeclaration decl = (CoreNamespaceDeclaration) attr;
                    if (decl.coreGetDeclaredPrefix().equals(prefix)) {
                        return null;
                    }
                }
            }
            return prefix;
        } else {
            return null;
        }
    }